21_InstSolManual_PDF_Part2 - 21-2 Chapter 21 21.3 Set Up...

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21.3. Set Up: Since the field is uniform over the plane of the coil, Solve: Half the flux means half the area, so with This gives 21.4. Set Up: A is constant and B is changing. Solve: (a) (b) 21.5. Set Up: A is constant and B is changing. Solve: 21.6. Set Up: is the flux through each turn of the coil. Solve: (a) The total flux through the coil is (b) 21.7. Set Up: is the angle between the normal to the loop and so and Solve: Reflect: The flux changes because the orientation of the coil relative to the magnetic field changes. 21.8. Set Up: and Solve: 21.9. Set Up: Since the field is uniform, Since the plane of the circuit is perpendicular to the field, and A is constant and B is changing, so and The current in the circuit is given by Ohm’s law, Solve: Reflect: The induced emf depends on the rate of change of the flux so it depends on the rate at which B is changing. It does not depend on the initial magnitude of the field. I 5 E R 5 0.045 V 15 V 5 3.0 mA. E 5 1 0.300 m 21 0.600 m 21 0.25 T / s 2 5 0.045 V. E 5 IR . P D B D t P 5 0.25 T / s. E 5 A P D B D t P E 5 P DF B D t P . cos f 5 1. f 5 F B 5 BA cos f . 5 30.2 m V E 5 2 m 0 nIA D t 5 2 1 4 p 3 10 2 7 T # m / A 21 40 3 10 2 turns / m 21 0.250 A 21 6.00 3 10 2 4 m 2 2 0.0500 s 5 3.02 3 10 2 5 V f 5 0°. B f 5 0. B i 5 m 0 nI F B 5 BA cos f . E 5 P DF B D t P . E 5 NBA 0 cos f
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